OK, let's work through this together. We're starting with 434 and we're going to multiply it by 18, which means we add 434 to itself 18 times.
Step 1: 0 + 434 = 434
Step 2: 434 + 434 = 868
Step 3: 868 + 434 = 1302
Step 4: 1302 + 434 = 1736
Step 5: 1736 + 434 = 2170
Step 6: 2170 + 434 = 2604
Step 7: 2604 + 434 = 3038
Step 8: 3038 + 434 = 3472
Step 9: 3472 + 434 = 3906
Step 10: 3906 + 434 = 4340
Step 11: 4340 + 434 = 4774
Step 12: 4774 + 434 = 5208
Step 13: 5208 + 434 = 5642
Step 14: 5642 + 434 = 6076
Step 15: 6076 + 434 = 6510
Step 16: 6510 + 434 = 6944
Step 17: 6944 + 434 = 7378
Step 18: 7378 + 434 = 7812

So, 434*18 = 7812